Just came across this article:
Murder, Mayhem, and a very small Penis, by Frederik Pedersen
http://academia.edu/187393/Murder_Mayhem_and_a_very_small_Penis
It examines the background for the murder of William Cantilupe, and explains the role of his wife and her (probable) lover, as well as the reasons the family incurred the enmity of his brother's wife and father-in-law.